ilovepdf_merged-6.pdf - Energy quiz Attempt review 1:58 pm...

This preview shows page 1 - 3 out of 40 pages.

7/6/21, 1 : 58 pm Energy quiz: Attempt review Page 1 of 9 ? attempt=2653728&cmid=1446882 Question Correct which these concepts are known. 1 Mark 6.00 out of 6.00 Question Correct Mark 7.00 out of 7.00 Δ H for the thermochemical equation 2 SO (g) + O (g) 2SO (g) is – 198 kJ, what is the enthalpy change for the decomposition of 1 mole of SO to give O and SO , all in the gas state? Method: Write down the equation of the reaction required (decomposition of SO to give O and SO ): SO (g) SO (g) + ½ O (g) Compare this equation with the one for which the thermodynamic information is available, and decide o 2 2 3 3 2 2 3 2 2 3 2 2 2 Started on Sunday, 23 May 2021, 3:56 PM State Finished Completed on Sunday, 23 May 2021, 5:31 PM Time taken 1 hour 35 mins Grade 85.00 out of 100.00 Descriptions of concepts used in thermodynamics are provided below. Match these with the names by which these concepts are known. Applied to a process that occurs without outside intervention Spontaneous ! Applied to a thermodynamic function with values independent of the path by which the system arrived at a particular state State ! A process in which heat is transferred from system to surroundings Exothermic ! The sum of all types of energy of all the components of a system Internal energy ! Applied to a system at equilibrium under a given set of conditions State ! A process in which heat is transferred from surroundings to system Endothermic ! The correct answer is: Applied to a process that occurs without outside intervention Spontaneous, Applied to a thermodynamic function with values independent of the path by which the system arrived at a particular state State, A process in which heat is transferred from system to surroundings Exothermic, The sum of all types of energy of all the components of a system Internal energy, Applied to a system at equilibrium under a given set of conditions State, A process in which heat is transferred from surroundings to system Endothermic Given that Δ H for the thermochemical equation 2 SO (g) + O (g) 2SO (g) is – 198 kJ, what is the enthalpy change for the decomposition of 1 mole of SO to give O and SO , all in the gas state? Method: Write down the equation of the reaction required (decomposition of SO to give O and SO ): SO (g) SO (g) + ½ O (g) Compare this equation with the one for which the thermodynamic information is available, and decide o 2 2 3 3 2 2 3 2 2 3 2 2 Dashboard / CHE144 Foundations of Chemistry (s1, 2021) / Energy (Weeks 8 - 10) / Energy quiz
7/6/21, 1 : 58 pm Energy quiz: Attempt review Compare this equation with the one for which the thermodynamic information is available, and decide what operations are necessary to make them identical. If you reverse a reaction, you must change the sign of Δ H . If you multiply a reaction through by a factor, you must multiply Δ H by that factor also. Select one:
Page 2 of 9 ? attempt=2653728&cmid=1446882 Question Correct Mark 10.00 out of 10.00 Methanol is manufactured by the partial combustion of methane under pressure, using a copper catalyst: CH (g) + ½ O (g) CH OH(l) Enthalpies of combustion are (in kJ mol ): CH (g), -893 CH OH(l), -729 3

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture